In 1999, Sister 1 and Sister 2, known to everyone else as Maurrie Sussman and Becky Clarke, were having such a good time on fly-fishing trips that they decided to include friends as well. Nearly 15 years later, the organization boasts 2,500 “sisters” worldwide. Membership is $60 a year and, along with fly fishing, activities include whitewater rafting and attending cowgirl college in Kaycee, Wyoming. Those male anglers thinking of joining as a way to meet a fly-fishing companion for life think again. “No husbands, no dogs and be nice,” are the only three rules, “although sometimes husbands, called ‘mister sisters,’ are allowed.”